Claudetite
(repeating unit)As2 O3 IMA symbol Ctd[1] Strunz classification 4.CB.45 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/n Unit cell a = 5.33 Å, b = 12.98 Å,
c = 4.54 Å; β = 94.27°; Z = 4 Identification Color Colorless to white Crystal habit Thin tabular crystals, fibrous crusts Twinning Contact or penetration on {100} Cleavage Perfect on {010} micaceous Fracture Splintery Tenacity Flexible Mohs scale hardness 2.15 Luster Vitreous, pearly on cleavage surfaces Diaphaneity Transparent Specific gravity 4.14–4.15 Optical properties Biaxial (−) Refractive index nα = 1.870 nβ = 1.920 nγ = 2.010 Birefringence δ = 0.140 2V angle 58° (measured) References [2][3][4]
(same H-M symbol)
c = 4.54 Å; β = 94.27°; Z = 4
Claudetite is an arsenic oxide mineral with chemical formula As2O3. Claudetite is formed as an oxidation product of arsenic sulfides and is colorless or white. It can be associated with arsenolite (the cubic form of As2O3) as well as realgar (As4S4), orpiment (As2S3) and native sulfur.[2]
It was first described in 1868 for an occurrence in the San Domingo mines, Algarve, Portugal. It was first described by and named for the French chemist Frederick Claudet.[3]
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